Yes they are they sell on the Grand Exchange for 185 gp each right now.
only after 10 years at the least if at all
From the RuneScape main menu, select "Game Guide" and "Grand Exchange". There you can get the current prices of tradeable items.
you actually dont get seeds you buy a non tradeable plant but i dont know were
You make it yourself, at a crafting table in your house. Or you just buy it at the Grand Exchange - it is tradeable.
It is not tradeable, but can be sold to Barlak in Dorgesh-Kaan for 600 coins and 500 Crafting experience.
I don't think there is. But you can simply click on the cannon to fill it up.
this was made in 2007 and has been hard to get as its not tradeable. if you want one, try killling random chickens. that's my advice and how i got my one
Since it is tradeable, you can buy it at the Grand Exchange. You can also pick it up in several places, near the shorelines - for example in Karamja, Brimhaven area.
You must do the dwarven cannon quest, so you can buy the cannonball mold. Then all you need is the mold and steel bars. Which you then smelt together.
Yes, easily. I wouldn't recommend doing them for experience. I use them for money if I need it. I am currently level 108 in runescape classic and 131 in runescape 2. I would recommend buying 2000 cannonballs and using a cannon there. It costs around about 715k for the balls but you will make that money back in 40 minutes. Also, after the first hour spent there with a cannon, you make 1 million gp+ per hour (only take bones) The more cannonballs you buy the better. My inv consists of 260 cannonballs 2 shark and I use glory amulet to tele to edgeville. I then sell the glory for 1k less after I use the charges. For level 80, I'd recommend about 8 monkfish though. And stay with the 260 cannonballs :)
CannonBalls R us
there are 4 cannonballs